Easy Halloween Mini Cookie Bars Recipe 👻🍫

Cream butter and powdered sugar until smooth. Mix in the egg yolk and vanilla, then add flour and salt and mix just until a dough forms. Chill for 30 minutes. Roll the dough to about 4 mm thick, cut into desired shapes and bake at 170°C for 10-12 minutes, until the edges are lightly golden. Cool completely before decorating or assembling. Fill the small details of the mold with colored melted chocolate, let set, fill each cavity with milk chocolate and press a cookie on top. Chill until firm, then pop them out.